- SseConnectionManager with per-agent SseEmitter, ping keepalive, event delivery
- AgentSseController GET /{id}/events SSE endpoint with Last-Event-ID support
- AgentCommandController with single/group/broadcast command targeting + ack
- WebConfig excludes SSE events path from protocol version interceptor
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>